<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // const first = () => (new Promise((resolve, reject) => {
        //     console.log(3)
        //     let p = new Promise((resolve, reject) => {
        //         console.log(7)
        //         setTimeout(() => {
        //             console.log(5)
        //             resolve(6)
        //         }, 0)
        //         resolve(1)
        //     })
        //     resolve(2)
        //     p.then((arg) => {
        //         console.log(arg)
        //     })

        // }))

        function first() {
            return new Promise((resolve, reject) => {
                console.log(3)
                let p = new Promise((resolve, reject) => {
                    console.log(7)
                    setTimeout(() => {
                        console.log(5)
                        resolve(6)
                    }, 0)
                    resolve(1)
                })
                resolve(2)
                p.then((arg) => {
                    console.log(arg)
                })
            })
        }
        first().then((arg) => {
            console.log(arg)
        })
        console.log(4)

        // 同   3  7  4
        // 微   1  2
        // 宏   5














    </script>
</body>

</html>